Improvement in lifting-jacks



UNITED STATES.4 PATENT OEEIGE.

HENRY M. WILLIS, OF MINEOLA, NEW'v YORK, ASS-IGNOR OF ONE-HALF HIS RIGHT 'IO GARRY VANDERBEEK, OF SAME PLACE.

IMPROVEMENT IN `Ll FTI'NG-JACKS.

Specifica-tion forming part of Letters Patent No. 209,635, dated November 5,1878 application led October 15, 1878.

To all whom it may concern:

Mineola, eountyof Queens, and State of New- York, have invented certain new and useful Improvements in Wagon-Jacks, and I do hereby declare the following to be afull, clear, and exact description of my invention, reference being had to the accompanying drawings, forming part of this specification, in which- 1 Figure 1 is aperspective view, Fig. 2 a side view, and Fig. 3 a 'rear view, of my wagonjack. v

Similar letters of reference indicate corresponding parts.

The 'object of this invention is to furnish an improved jack for raising the axles of Wag- 011s, for the iling of the same or the washing of wheels, which shall be simple in construction, convenient in use and reliable in operation.

The invention consists in the'construction and combination of parts, which will be hereinafter more fully described, and then set forth in the claims.

A is the base, rising` vertically from which is the standard B, provided near its upper portion with the series of notches or depres- O is the lever, being in its upper part a straight bar, but expanding at about the point j into two arms, c c, which pass to either side of the standard B, and which at their extreme ends have a slight upward curve.

D is the liftingplate, compassing the four sides of the standard, having the lugs'dl d2 cl3, and joined on opposite sides to the arms e cof the lever C by connecting-rods h rigidly secured to the plate D.

.Pin 7c fastens the connecting-rods with the arms of the lever.

gis the fulcrum-pin joining the arms e e and working in any one of the notches or depressions f.

t' is a rod or guard passing between the arms e e, traversing the distance of the notches, and secured at both ends to the standard, designedl to keep the fulcrum-pin g near the standard when shifting it from notch to notch, thus securing greater ease of operation.

The operation of the jack is as follows:

The lever O being thrown upward, as in Fig.

ard B and the connecting-rods h, and that the lifting-plate D, when the lever O is depressed, is in a slanting position, the side upon which the axle rests being elevated above the opposite side. This position of the lifting-plate gives an additional security to the axle remaining on the plate.

In the drawings I have represented the -arms of the lever O as curved; but this construction is not absolutely essential, as a straight double-armed lever can be used to bring the connecting-rods h from a vertical to a slanting position and accomplish substantially the same results as the lever C, as shown 5 but with either lever, the fulcrum being near the lifting-point, a great power can be exerted with a comparatively slight pressure.

In lowering the axle after oilin g or washin g, it is only necessary to raise the lever, when the lifting-plate will be brought to its rst poe sition. k

In the construction of my jack, preferably, I make the base and standard of wood and the other parts of iron or steel.

If the wooden rests for the fulcrum-pin are not sufficiently stout to stand the stra-in put lupon them when the lifting-plate supports the axle, they can be strengthened by facing the sides of the standard in the vicinity of the notches or rests with plates of metal.

Having thus described my invention, I 2. Inalifting-jack, the lifting-plate D, llavclaim as new and desire to secure by Letters ingthe projecting lugs d1 d2 d3, substantially Patentas described.

l. In a lifting-jack, the combination of the notched standard B with the lifting-plate D, Witnesses: conneeting-rods h, and double-armed lever C, H. W. EASTMAN, arranged substantially as described. H. M. W. EASTMAN.

HENRY M. WILLIS. 

